| Canonical Name: | B2 1420+32 |
| TeVCat Name: | TeV J1422+323 |
| Other Names: | OQ 334 |
| Source Type: | FSRQ |
| R.A.: | 14 22 30.38 (hh mm ss) |
| Dec.: | +32 23 10.44 (dd mm ss) |
| Gal Long: | 53.35 (deg) |
| Gal Lat: | 69.59 (deg) |
| Distance: | z=0.682 |
| Flux: | 0.15 (Crab Units) |
| Energy Threshold: | 100 GeV |
| Spectral Index: | 3.57 |
| Extended: | No |
| Discovery Date: | 2020-01 |
| Discovered By: | MAGIC |
| TeVCat SubCat: | Default Catalog |
Source Notes:
This source was moved from the "Newly Announced" to the "Default" Catalogue on 210105.
This detection was announced on 200121 in an
ATel by the MAGIC Collaboration.
Detection:
From
Mirzoyan for the MAGIC Collaboration (2020):
- "The object was observed with the MAGIC telescopes for 1.6 hours on
2020/01/21 under weak moonlight. The preliminary analysis of these
data resulted in the detection of B2 1420+32 with a statistical
significance of more than 13 standard deviations."
- The MAGIC observations were triggered by flaring activity in high
energy gamma-rays, reported by the Fermi-LAT collaboration (
ATel #13382)
and lasting for a few weeks. The Fermi-LAT team kindly reported a
recent enhanced activity from B2 1420+32 to the VHE community.
Source Position:
From
Mirzoyan for the MAGIC Collaboration (2020):
- R.A. (J2000): 14 22 30.38
- Dec. (J2000): +32 23 10.44
- These coordinates are not reported to come from the TeV data and correspond to
those given in
NED
provided by
Petrov & Taylor (2011).
Source Flux:
From
Acciari et al. (2020):
The source was detected by MAGIC during two different periods
corresponding to a VHE flare and to the post-flare period.
The flux can, during each period, be described by a power law of the form: dN/dE = N0*(E/E0)^(-A).
For each period the measured and the de-absorbed spectrum is reported (using the model of
Dominguez et al. 2011):
During the VHE flare the power law has the following parameters:
- A (measured): 4.22 +/- 0.24 (stat)
- A (deabsorbed): 3.57 +/- 0.29 (stat)
- N0 (measured): 2.49 +/- 0.31 (stat) x10e-9 TeV-1 cm-2 s-1
- N0 (de-absorbed): 4.04 +/- 0.54 (stat) x10e-9 TeV-1 cm-2 s-1
- E0: 100 GeV
- F_int (> 100 GeV): 7.8 +/- 1.3 (stat) x10e-11 cm-2 s-1
During the post-flare the power law has the following parameters:
- A (measured): 3.90 +/- 0.25 (stat)
- A (deabsorbed): 2.87 +/- 0.36 (stat)
- N0 (measured): 0.91 +/- 0.13 (stat) x10e-9 TeV-1 cm-2 s-1
- N0 (de-absorbed): 1.64 +/- 0.22 (stat) x10e-9 TeV-1 cm-2 s-1
- E0: 100 GeV
- F_int (> 100 GeV): 3.9 +/- 0.6 (stat) x10e-11 cm-2 s-1
From
Mirzoyan for the MAGIC Collaboration (2020):
- "The VHE flux of this detection was estimated to be about 15 % of
the flux from the Crab nebula above 100 GeV."
Source Distance:
From
Mirzoyan for the MAGIC Collaboration (2020):
- B2 1420,32 is located at a redshift of z=0.682 (
Hewett & Wild, 2010)
- "It is the fourth most distant blazar with an observed VHE emission so far."
Classification:
From
Mirzoyan for the MAGIC Collaboration (2020):
- "B2 1420+32, also known as OQ 334, is a blazar ... and classified as
a Flat Spectrum Radio Quasar (
Healey et al. 2007)"
Seen by: MAGIC
-
Probing photon-ALP oscillations from the MAGIC observations of FSRQ QSO B 1420 +326
Pant, Bhanu Prakash, Phys. Rev. D 109 p023011 (2024) [LINK]
-
Detection of very-high-energy gamma-ray emission from B2 1420+32 with the MAGIC telescopes
Mirzoyan, R. on behalf of the MAGIC Collaboration, The Astronomer's Telegram 13412 p1 (2020) [LINK]
-
VHE gamma-ray detection of FSRQ QSO B1420+326 and modeling of its enhanced broadband state in 2020
Acciari, V.A. et al., arXiv e-prints parXiv:2012.11380 (2020) [LINK]
Want a reference added? Send a bibtex entry to
the TeVCat Team
